Nuno, I agree, 602 would be plenty of board. You could go smaller to 600 even. I am 82 kg 6'1 intermediate and recently bought 600 Hellfire. It has plenty of float for me, catches waves and surfs really easy. If anything I think I could have gone smaller to 510 as initial impression is that I am losing the fins a bit in high speed turns (futures AM2 fins).

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I'll get the HF 6'2" since we dont get that much boards in portuguese surf shops, one has to content with what is stock. Small country, small credit but great free waves... thats what you get from a low industrialized country!

I would be greatfull if you could also get some advice on FCS fins to go on this FireWire board.

Nuno, I've not ridden the new board enough to judge fins for sure, but from my experience and reading on this forum I will recommend that you go for fins on the larger side. In FCS that would be AMG, PC7, SA? or the like.